在分析无刷直流电机的等效电路模型和换相过程的基础上,考虑了电磁时间常数和反电势对换相转矩的影响。通过导出换相时关断相电流下降到零的时间和开通相电流上升到最大的时间,分析高、低速运行状态下两者的关系,引入一个开通角的变量,通过控制开通相的开通时刻来抑制换相时的转矩脉动；并且考虑非理想的气隙磁密等因素对开通角进行修正。结合场路耦合的有限元进行仿真,结果表明此思路是可行的。

Bases on the analysis of the equivalent circuit model and the commutation process of the BLDCM, the effects of electromagnetic time constant and the back EMF to torque ripple were considered, by solving the time what opening and closing phase need, the relationship between the two different operating conditions was analyzed, introducing a variable which called turnon angle, controlling the torque ripple during the phase change by controlling the opening time of the opening phase; and the non ideal air gap magnetic density and other factors to modify the opening angle were considered. Combined with finite element simulation, the results showed that this method was feasible.

TM 301.2